Question

Weight of the coal is 2g and after heating the coal sample, the weight of the coal is 1.82g. What is the % of the moisture in coal?

(a) 20%

(b) 9%

(c) 10%

(d) 30%

I had been asked this question by my college professor while I was bunking the class.

I'm obligated to ask this question of Analysis of Coal and Selection topic in chapter Fuel Technologies of Applied Chemistry

Answer 1

Correct answer is (b) 9%

To elaborate: We know that % of moisture=[(w1-w2)/weight of coal]*100, where w1=weight of the coal sample, w2=weight of the coal after heating. After substituting the given values in the formula, you’ll get 9% as an answer.

Here’s the calculation step-by-step:

((2 – 1.82) / 2) * 100

==> (0.18/2) * 100

==> 0.09 * 100

==> 9%